Hi all, I'm working on this project, wherein a gpg-encrypted file is being generated and transmitted from one end and is being received and processed on another end. your key without a passphrase. So far so good. I am able to run the command line and get the passphrase prompt. I thought I might share in case there is another lost soul In the bash shell, gpg2 --batch --gen-key < seems to work fine for removing a passphrase. Once I input the passphrase all works well...so I know the command is just fine. But immediately after that, it decrypted without prompting for a passphrase. I run gpg -c file.It asks for a password (twice) and creates an encrypted file. To automatize the gpg signing, I have to remove the passphrase from the key pair. Answer: On a high-level it works like this: First of all you need to create PGP key-pair; it’s called a key-pair because there is a pair of keys - private and public When file is encrypted (locked) with a Public key it’s considered safe (unauthorized people will not be able to unlock it and read the contents). These notes are based on Windows 10 with Gpg4win. gpg remove passphrase, Let me share what I found. I work on the receiving end, and I already have the decryption part working by entering a passphrase. The goal is now to remove the existing passphrase from the key pair, making it into a passphrase-less, unprotected one. Question: How it works? 7. No, you'll have to pipe it through a file descriptor with --passphrase-fd. 6. Your key is encrypted when stored on disk so that an attacker getting hold of the file doesn't yet have your key. Gpg can create key pairs without passphrase, and it can also change the passphrase of an existing key pair. needless to say, this "encryption" is totally worthless.. Thus, it can't be automatized. I also have the private key used for decryption in the key ring. Even after selecting the above checkboxes it asked for passphrase once. >encryption or decryption? I checked the existing post link below, but that explains only for Linux. gpg --batch --passphrase-fd 0 --output "myoutput" --decrypt "myencryptedfilename" < echo mypassphrase Note: the batch option is required to not have the UI prompt come up. If you are trying to decrypt a file or a bunch of files using batch file in windows you will write something like this: gpg --pinentry-mode=loopback --batch --yes --passphrase "abc%123" --decrypt-files *.pgp gpg decrypt without using passphrase. However, when you use gpg-preset-passphrase in a way that stores the passphrase argument plainly on disk as well, the attacker can simply read that file as well and decrypt your key. You should now see the contents of the message in the Command Prompt window. You will now be prompted to enter your GPG passphrase. Without this option, I will be prompted on the >console. I have the newest version of GPG for windows installed on the machine. But with the echo command it can be done on a commandline too on fd 0: echo password | gpg --passphrase-fd 0 --decrypt / --encrypt. Gpg without passphrase. Doesn't talk about the Windows gpg agent. The intention here is that 'n' is a file-descriptor number that you use to pipe the passphrase to gpg. For example, you could do something like this in shell: cat passphrase-file | gpg --passphrase-fd 0 This would place the contents of the passphrase-file on gpg's stdin (fd=0). 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